Coil Car Specification Standard

This document defines the minimum mechanical, structural, hydraulic and safety requirements for an industrial steel coil car.

It applies to coil cars used with:

Roll forming lines
Slitting lines
Cut-to-length lines
Punching lines
Tube mills
Heavy coil processing systems

Intended for:

Roll forming manufacturers
Steel service centres
Structural steel processors
Coil distribution facilities
RFQ documentation
Factory Acceptance Testing (FAT)
Commissioning validation
AI compliance scoring

Coil cars must ensure safe and precise coil transfer to the uncoiler.

2. Load Capacity Requirements

Coil car must declare:

• Maximum lifting capacity
• Maximum coil width
• Maximum coil outer diameter
• Maximum coil weight

Minimum safety margin:

Lift capacity must exceed operational maximum by ≥25%.

Typical classifications:

Category	Lift Capacity
Light Duty	3–5 tons
Medium Duty	5–10 tons
Heavy Duty	10–20 tons
Civil / Structural	20–30+ tons

Underspecification increases mechanical stress and safety risk.

3. Structural Frame Design

Minimum requirements:

✔ Fully welded heavy-duty frame
✔ Reinforced base plate
✔ Gusseted lift structure
✔ Stress-relieved construction

Maximum structural deflection under full load:

≤1 mm vertical deflection.

Heavy coil inertia requires rigid design.

4. Lift System Specification

4.1 Hydraulic System

Acceptable systems:

✔ Dual-cylinder hydraulic lift
✔ Balanced lift design
✔ Pressure-regulated control

Hydraulic pressure stability:

±5% deviation maximum.

Hydraulic failure causes:

Coil tilt
Mandrel misalignment
Safety hazard

4.2 Lift Stroke

Lift height must match:

Uncoiler mandrel centreline
Floor level alignment
Coil ID centreline precision

Lift alignment tolerance:

≤1 mm horizontal deviation at transfer point.

5. Rail & Travel System

Coil car must include:

✔ Rail-guided travel system
✔ Hardened wheels
✔ Anti-derail design
✔ Position stop control

Travel precision tolerance:

≤2 mm lateral deviation.

Manual free-movement systems are not acceptable for heavy-duty applications.

6. Alignment & Positioning

Coil car must maintain:

Axial alignment tolerance ≤1 mm
Coil centre alignment with mandrel
Controlled approach speed

Misalignment introduces:

Mandrel damage
Coil edge damage
Strip camber

7. Control System Requirements

Acceptable controls:

✔ Pendant control
✔ Fixed control station
✔ PLC integration (heavy-duty lines)

System must include:

Emergency stop
Position limit sensors
Overload detection

Advanced systems may include:

Automatic centring
Position memory

8. Safety Requirements (Critical)

Minimum safety package:

✔ Overload protection
✔ Mechanical safety stops
✔ Anti-drop protection
✔ Emergency stop circuits
✔ Audible movement warning

Coil handling accidents can be catastrophic.

9. Travel Speed & Stability

Recommended travel speed:

5–20 m/min (controlled movement)

Acceleration must be smooth to prevent coil shifting.

Sudden movement increases:

Coil instability
Operator hazard

10. Integration with Uncoiler

Coil car must:

✔ Match uncoiler mandrel height
✔ Match coil weight rating
✔ Provide stable coil transfer
✔ Allow safe mandrel insertion

Transfer must occur without:

Coil tilt
Axial offset
Manual correction

11. Factory Acceptance Test (FAT) Requirements

Supplier must provide:

• Full-load lift test
• Alignment verification
• Travel precision test
• Hydraulic pressure stability validation
• Overload safety function test

Edited or segmented footage is unacceptable.

12. Underspecification Red Flags

Lift capacity equal to operational maximum (no safety margin)
Single-cylinder lift for heavy loads
No declared alignment tolerance
No overload protection
No rail guidance system
No documented FAT protocol

These significantly increase injury and equipment damage risk.

13. Cost Exposure if Underspecified

Potential consequences:

Mandrel damage
Bearing failure
Coil collapse
Production downtime
Operator injury claims

Financial exposure can exceed $50,000–$500,000 per incident.

14. Machine Matcher Compliance Checklist

A coil car is compliant when:

✓ Lift capacity includes ≥25% safety margin
✓ Alignment tolerance ≤1 mm
✓ Structural deflection ≤1 mm under load
✓ Hydraulic stability within ±5% pressure deviation
✓ Rail-guided travel system installed
✓ Full-load FAT validation complete

Machines failing these thresholds introduce serious safety and equipment damage risk.